Grinding-mill.



Patanted Oct. 8, I91.

4L M IL A P R enmnme MILL.

(Application filed Aug 30, 1900.)

(No Model.)

Urirrnn STATES PATENT @rrrcn.

CHARLES J. PALMIE, oF MUNICH, GERMANY.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 683,976, dated October8, 1901.

Application filed August 30. 1900. Serial No. 28,521. (No model.)

To all whom, it Hui/y concern:

Be it known that I, CHARLES J. PALMIE, a citizen of Germany, andaresident of Munich, Germany, have invented certain new and usefulImprovements in Grinding-Mills, of which the following is aspecification.

This invention relates to a mill for grinding colors, chocolate, cocoa,chemicals, and other substances, in which the material ground issubjected to additional pressure while being acted upon by thegrinding-bodies.

The accompanying drawing represents a vertical longitudinal section,partly in elevation, of my improved grinding-mill.

The letter a represents a chamber or cylinder supported upon legs 1) andadapted for the reception of the material to be ground. Thegrinding-stones c and e are arranged beneath the cylinder, the lowerstone e constituting the runner and being rotated by shaft f. Thecontiguous grinding-surfaces of both stones are centrally cut away toform a stellated pocket g h, into which the material to be ground isconducted from cylinder at by channel 1', formed by a central transverseperforation of upper stone 0. During the rotation of the runner e thepoints of the star will cause a reduction of all the larger lumps ofcolor, &c., which otherwise would not be able to enter between thestones.

The material to be ground is subjected to pressure while between thegrinding-surfaces, and thus the out-put of the machine is greatlyincreased. For producing this pressure, liquid, as well as gas, and alsolevers, screws, eccentrics, weights, and springs may be employed, or thepressure may be obtained by gearing or in any other suitable manner. Thedrawing shows the apparatus adapted for liquid or gas pressure.

The cylinderais closed by an aii tightcover j, and the liquid or gas,such as air, is introduced through cock is. The pressure is transmittedby piston Z to the material to be treated.

To prevent the stones 0 e from running hot through the increasedfriction created by the pressure upon the material, I provide theapparatus above the stone 0 with a cooling device that prevents heatingof this stone as well as of the runner. The cooling device con sists ofa chamber m, arranged between cylinder a and stone 0, into which duringthe working of the machine cold air or water may be introduced throughinlet n, which is discharged at o; If desired, this chamber at may alsobe used for holding ice.

In grinding materials that are first liquefied by heat and can then onlybe ground-such as chocolate, cocoa, &c.-the chamber at can be used as aheating-chamberby being charged with hot air or hot water. While thesematerials are ground a cooling of the grindingsurfaces is not necessary,because the butter or other fatty matter melting out of them preventsthe stones from running hot.

My improved grinding-mill is particularly adapted for all colors whichare to be ground in oil, varnish, water, alcohol, or ethereal oils, aswell as for cocoa, chocolate, and all chemicals, liquid or pasty and inthick or dilute form. It possesses the following advantages: By placingthe material under additional pressure even the thickest color may becompletely ground by passing once through the machine. The pressure alsopermits the two grindingsurfaces to be brought much nearer together,whereby'a greater fineness of the color is obtained in a much shortertime. The machine does not require any attention after the cylinder hasbeen charged and after it is started, as the piston presses all materialautomatically downward and off the cylinder-walls. The speed of the feedmay be accurately regulated by setting the pressure. The air-tightcoverj over piston Z prevents a drying up of' the color or evaporationof the water and prevents oils from turning resinous or evaporating. Therunner can rotate more quickly than heretofore on account of thecooling-chamber,

which prevents a heating of the grinding-surfaces. The machine can beeasily and quickly cleaned, as it contains smooth surfaces only.

The pressure on the material also permits the grinding of color-skinsand permits thick color residues of color pots, tubes, and otherreceptacles to be ground into a serviceable condition.

What I claim is- A grinding-mill provided witha lower and an uppergrinding-body, a duct extending through the upper grinding-body, apocket intermediate the grinding-bodies into which 2 eeaeve the innerend of said duet opens, a chamber communicating with the outer end ofthe duct and adapted to receive the material 130 be ground, means forcompressing said material I Within said chamber, and an air-tight coverfor closing the chamber,substantially as speci- Signed by me at Antwerp,Belgium, this 10th day of July, 1900.

CHARLES J. PALMIE.

Witnesses:

STANIsLAs H. HAINE,

fied. 1 JON. EONYDORFF.

